The source project of this merge request has been removed.
KFileItemModel: Allow to group files and folders together
When folders size is available and unless sort dir first is set, folders and files can be grouped together in the regular size groups.
Without this you can end up with multiple groups being added each time a folder size alternates with a file size.
Relates to d520b417
Conterpart of !184 (merged) for grouping sort.